Impkovbment if gas meters



EPATENTED JULY 2Q, 1860'.

' J. SGHATT.

GAS METER.

JOHN scum-r, or PHILADELPHIA, PENNSYLVANIA. IMPROVEMENT IN GAS METERS.

'Specifi'cationform-ing part of Letters Patent No. 29,323. dated July24, 1860.

To aZZ whom it may concern.-

Beit known that 1, JOHN SoHAT1,of the city of Philadelphia; and State ofPennsylvania, haveinvented a new and useful Improvement; in Framing theDiaphragms'of Dry Gas-Meters; and I dohereby declare'that the followingis a full, clear, and exact description of the construction andoperation of the same, reference being had to the annexed drawings,making a part of this specification, in which- Figure 1 representsascctional plan view of a diaphragm with my improvement applied; andFigs. 2 and 3, transverse sections of parts of the same, like lettersindicating the same objects when on the difierent figures.

The nature of my invention consists in so enlarging and bending orfolding the sheet metal, of which part of the frame of thediaphragm ismade, as hereinafter described, that l the outer edges of the said frameshall be much farther removed from thcleatherof the diaphragmthanheretofore, whereby during the process of the subsequent solderingof the diaphragm in its place within the meter the edges of the saidleather thereof are prevented from injury by the heat of thesolderingtool; and also the further advantages attained of permittingthe shields to be attached nearer to the inner edges of the frame, thuspreventing irregularity in the measurement, from the excess of theirplay at any time, from this cause, and also permitting the leather ofthe diaphragm to be saturated with oil, or its pores stopped uptherewith, before the diaphragm is inserted in the meter.

In the drawings, A represents the frame of v the diaphragm, B a sectionof the leather or skin partly secured in the frame, and Cone of theshields usually attached to the skin.

The frame A is composed of two parts,d and d, each consisting of fourstrips of sheet metal soldered together at their corners; but heretoforethe part d has been formed of much narrower strips of sheet metal, andwith their ,outer edges bent ove'r..upontheyinner part, (1, the edgesofthe leather B being overlapped between the two parts, and consequentlyin subsequently soldering the diaphragms fast in the meters the leatherbetween and near to' the twoparts of the frame would. from its nearnessto the soldering-iron, become drawn and scorched, and as-this injuriouseffect would be increased by the presence of oil in the leather or skinB the oil whichis required to stopup the pores thereof had to be appliedafter the diaphragms were securedliu the meter, and consequently some ofthis oil would necessarily pass through the pores (in theapplication) tothe inside of the chamber, andwould during the subse'quentusing'of theme: ter rise with the gas and eventually cause a sticking conditionofthe valve. To obviate these objections, 1 construct the part d .of theframe A by preparing much wider strips of sheet metal for the purpose,and bending them so as to form a projection,1,extending beyond the part2 thereofiwhich overlaps both the edge of the leather Bandthe in nerpart, d, of the said frame,as seen in Fig.2, This extreme outer edge ofthe projection 1 may be left either flat. r bent upward, as seen in Fig.2, or downward, as seen in Fig. 8,'as may be found best adapted to thepart of the meterto which it is to be soldered."

The leather B is applied, as heretofore, be

tween the two parts (1 and d, as seen in Figs.

'1 and 2, and secured by simply pressing down closely the vertical edge2 upon the part (1, with the edge of the leather B between them, theprojecting surplus of the leather being afterward cut away, as seen inFig. 2, and also partly in Fig. 1'.-

It will be'eviden-t by the thus forming the part 7 d of the frame A withthe projecting edge 1 that the heat of the soldering-iron, in fixingthe'diaphragms in the meter, cannot injure the leather B, or even causeit to become more than slightly warmed, and for this reason it is alsoevident that the usual shields, C, may be attached much nearer to theinner edges of the frame than heretofore, and thus a greater steadinessor uniformity in the motions of the joints will be produced, and soprevent the usual variations, from such cause, in the measuring capacityof the chamber;

and also it will be evident that the pores ofthe leather B may bestopped up with the oil as required and the surplus oil wiped off cleanbefore the diaphragms' are soldered in the meter,'all of which areadvantages of great importance in the manufacture and use of tension, 11, around its miter edge,'sui)standrygas-meters tially in the 'mannerand for the purpose set Having thus fully described my invention forthand described.

and pointed out its utility, what I claim as JOHN. SCHATT.

new, and desire to secure by Letters Petent,v Vitnesses: W is- BENJ.MORISON, Making the fmme .A with a, projecting ex- JNO. B. KENNY.

